If you need to compromise in the end due to space, one option is to have small high quality caps local to the output so that high frequency currents are kept to short local loops. Then use larger caps in the middle which will handle lower frequencies - and capacitive coupling of small voltage drops produced by currents flowing in low resistance wide traces to any 'sensitive' traces crossing above will be somewhat ameliorated.

__________________"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.

I really want advice , have not built a good CFA yet. The NFB path can not (should not) "snake" around the
sensitive predriver/Vbe area. Shown are the wires (in pink/red - below).
On a double sided PCB one could bring it down along a rail - later date.
Is there a better way ?
OS

Run a wire link on the back of the board for the FB return if you want to keep it
separate.

In my nx-Amp layout I just put the FB resistor and gain setting resistors all very close together at the diamond summing junction and ran the connection to THD output as a dedicated track to just before the Zobel (advice from D Self). The clean and dirty grounds are separated by 10 Ohms. I terminated the feedback lower resistor on the clean ground side.

I have no issues with either the nx-Amp or the sx-Amp. Both are exceptionally quiet and sound wonderfully clean and open.

In my nx-Amp layout I just put the FB resistor and gain setting resistors all very close together at the diamond summing junction and ran the connection to THD output as a dedicated track to just before the Zobel (advice from D Self). The clean and dirty grounds are separated by 10 Ohms. I terminated the feedback lower resistor on the clean ground side.

I have no issues with either the nx-Amp or the sx-Amp. Both are exceptionally quiet and sound wonderfully clean and open.

I saw Jim's audio NX PCB.
You have the array of resistors in parallel (the divider) near the OPS and
only run the divided Voltage back to the NFB point.

I have a bit more "acreage". My input stage will be inches from any
high current areas .... Capacitance multipliers will be between drivers/ops
and input stage.

Does anyone think 77 X 200mm for the 3 pair or 77 X 250mm for the 5 pair is
too large of a layout.
Once I do the 3 pair layout - I can extend to any mumber of Op pairs in
sprint ... very easy.

"You have the array of resistors in parallel (the divider) near the OPS and
only run the divided Voltage back to the NFB point."

It looks like that but they are physically close to the summing junction. The boards are quite small. You have to watch out for capacitance from the feedback junction to ground or across the feedback resistors otherwise you can get gain peaking.